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1.
When someone says something, or adds something to an already funny situation with the intent of making it funnier, but it kills it.

Totally.
Guy one: "...then he said 'where's the chicken?!'" Guy two: "hahahahahah" Guy three: "ahha yeah, then he ate some noodles!" ... "Dude...spoongun..."
by Hevesker August 22, 2010